"Hans Franke" <Hans.Franke(a)mch20.sbs.de> said:
> Well, as long as you think along a 'real' drum with flying heads
> etc. you're right, but there is a simple solution - take a card
> board tube and warp regular cassete tape around, and let a head
> read/write this tape ... if you take an old style washing powder
> drum (ca. 30 cm diameter / 1 ft) you get a lenght of about 1m
> (3 ft 4") - what was the usual speed of cassetes ? 4 cm/s ? I'm
> not shure (Tony ?), as a rough estimation you get a track size
> of some 3 kByte and an average access time of 12s not to bad ...
I have this really sick and perverted habit of picking up
unusual items just in case they might be useful for future
projects. All of this talk about building a drum storage
reminded me of something that I added to my eclectic resource
pile a few years ago, an old drum type fax machine.
But, when it comes to adding mass storage to a digital
computer system, IMHO I can't think of anything faster,
easier, or more reliable than the old Commodore 1541.
* The DOS is built-in.
* Only the system side communication routines need to be
written and there is commented source code to use as
examples.
* The drive side communication routines can also be
rewritten.
* Since the communication with the drive is normally
handled with very robust handshaking, the speed of the
computer system is totally unimportant. This also means
that disk I/O can be easily interrupted.
* And additional drives can be daisy-chained on the same
bus.
Regards,
--Doug
=========================================
Doug Coward
@ home in Poulsbo, WA
Analog Computer Online Museum and History Center
http://www.best.com/~dcoward/analog
=========================================
Another pointer to a web page about chemicals to remove grease and nicotine
for many surfaces.
http://www.energy2green.com/uses4.html
Seems to me that these products will clean computer stuff as well as car
parts.
http://www.idealchemicalproducts.com/AutoDetail-1.html
I especially like the part that lets you pick the fragrance you prefer.
I think Pina Colada or Bubble gum would be perfect for a Mac. :)
That's the next wave in computing, different fragrances to match the color
of you computer. I'm really partial to ozone when I'm around big iron.
Deodorants
Spray deodorants for use in auto detail shops
Available in Bag-N-Box
Long lasting fragrances
Super concentrated
Water soluble
Contains no colorants
USES: our deodorants are super concentrated and water soluble. Each product
should be diluted with water prior to use and can be used to reduce malodors
in a variety of applications including automobiles, campers, tractor cabs
and sleeper areas, automobile trunks, bathrooms and shower areas, hotels and
motels, nursing homes, day care centers, restaurant garbage areas and any
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not harm any surface not harmed by water. Our deodorants are non staining,
long lasting and economical to use. USE DIRECTIONS: mix 4 to 8 ounces of our
concentrate with 1 gallon of water. Fill either a trigger spray bottle or
pump up sprayer with dilute solution and spray area to be treated. Repeat if
necessary. Concentrates can also be used in the evaporative air flow type
room deodorizers. Simply pour concentrate into the holding container or tank
and close door. All the different fragrances that we offer are listed below
with product number for ordering
* PEACHIE (Fruit) 4-248
* HALT (Cherry) 4-239
* LEMON 4-372
* STRAWBERRY 4-444
* ORANGE 4-241
* BABY FACE (Baby Powder) 4-312
* LIME 4-445
* VANILLA 4-242
* WATERMELON 4-255
* PINEY 4-373
* PARADISE (Floral) 4-912
* PINA COLADA (Coconut) 4-246
* RASPBERRY 4-446
* BUBBLE GUM 4-243
Mike
mmcfadden(a)cmh.edu
From: Hans Franke <Hans.Franke(a)mch20.sbs.de>
>
>Maybe I should specify my question ... I need to know
>at what date these chips where at first available -
>not just the era. A good single IC to use could be the
>74181 ALU.
Around 71. Then the H, S, LS, ALS and F parts.
>> I have a 74 TTL design guide at home, so I'll check it too.
>
>The oldest datasheet I could find says Dec 1972 for the 74S181
Sounds close to right. The S however was later the basic 74181
was first. Infact the July 1972 issue of Ham Radio Has a supplier
selling the 74181 for $4.50!!
Allison
On May 18, 11:30, Hans Franke wrote:
> AFAIR you also have to use either 'adaptor plugs - or fit a new pwower
> cable, since the Sorcerer had a fixed one. And there is nothing more
> stupid in the world of power transmission than these plugs ...
The power cable is fixed, but the plug on the end (that goes into the wal
socket) was not a mouilded plug; it was a rewirable one, so it's very easy
to remove and fit an appropriate type without mangling the cable. Not
usaully a problem for me anyway, as it happens I have some Schuko sockets
on my bench as well as lots of British 13A sockets.
> Unless the PS is already switchable and there is a Kaltgeraetestecker
> (no idea how these inlet connectors are called in english, where the
> power cord is detatchable)
The three-pin type I think you mean we just call an IEC inlet or IEC
socket. The ones that have the notch we call "hot-condition" IEC
plugs/sockets (like the ones you get on a kettle).
> I always keep the original condition - for
> the short time I play around with a specific unit (seldom more than a
> few weeks) a stepdown transformer is a fine solution.
Sensible enough, but in this case there is provision inside the Sorcerer to
rewire the transformer primaries, and it's documented in the manuals.
--
Pete Peter Turnbull
Network Manager
University of York
In a message dated 5/18/01 12:18:08 PM Eastern Daylight Time,
cmurillo(a)manizales.autonoma.edu.co writes:
> "Iggy Drougge" wrote:
> -snip-
> > they let me have it
> > for 50 crowns. My pleasure.
>
> You were lucky; I'm envious. I'd like to have more of these.
>
Heck, I'd like to have ONE!
-Linc Fessenden
In The Beginning there was nothing, which exploded - Yeah right...
Calculating in binary code is as easy as 01,10,11.
On May 17, 19:34, Richard Erlacher wrote:
> Has anybody tried one of the DALLAS "smart socket" products with this
thingie?
Unfortunately the 48T02 is a TOD clock and calendar as well as NVRAM, so
there's no suitable SmartSocket to replace it. The registers have to be at
particular places and use a particular protocol too.
--
Pete Peter Turnbull
Network Manager
University of York
"Iggy Drougge" wrote:
-snip-
> they let me have it
> for 50 crowns. My pleasure.
You were lucky; I'm envious. I'd like to have more of these.
> Once I had bought it, though, I though that
> 9000/300 was a suspiciously low number. Wasn't that some kind of 68010 based
> machine? And why would such a machine have two Ethernet NICs?
It probably found a second life as a router. Good for the guy
who realized that the machine was still useful.
> It really semed
> like a waste, but on the underground ride how, I pulled out the big board with
> all the ports, which seemed notably shinier and newer than the NIC above, and
> found that it had a 68040. I thus deducted that it must be a 9000/380. Has
> this machine been upgraded, or did HP simply not bother to identify their
> machines any closer than the series (in this case 9000/300)?
That's indeed the case. All hp300 systems were pretty modular, although
there were some, such as the 340, that were more closed.
> In any case, it came without keyboard, and I read that in order to switch it
> over to serial terminal mode, one would have to perform a certain manoeuvre
> via the keyboard. Bloody well thought out, HP! Is there no way to use a serial
> terminal without any HIL keyboard involved?
I was forced to leave my 380's monitor behind (darn hp98754a weighed
about 100 pounds!) when I moved. I haven't yet gotten down to
setting up the 380 in its new home, and I will have to reconfigure
it to use a serial console. But I do have some HP-HIL keyboards.
> The machine starts up and beeps a little. It's got not drives installed, but
> there's a 50-pin "Centronics" connector marked SCSI/FS-HPIB. What is FS-HPIB?
> Doesn't sound like anything I'd like to feed into my SCSI devices.
The connectors in mine are marked (left to right, top to bottom)
1) BNC for LAN
2) AUI
3) parallel port (pc style)
4) HP-HIL
5) 9 pin PC style RS-232
6) SCSI/HS HP-IB (50 conductor Centronics)
7) 1/8" spkr
8) HP-IB
The board is a 98574-66510 Rev C and the ROM is labeled
1818-5062 2/22/91. The cpu is a 25MHz RC 68040.
Close to the SCSI header connector in the board there is
an unconnected 34 pin header. Maybe that's the HS-HPIB.
Indeed, HS-HPIB stands for a faster version of HPIB
that was intended for mass storage only; later 300 systems
such as the 370 had "human interface boards" (i.e., I/O
boards) with HS-HPIB in an attached cable, plus the
other usual ports and interconnects.
I use the SCSI and the standard HPIB connectors in mine
without problems and I am able to boot netBSD off an ST410800N
on the SCSI chain or HPUX 9.1 off three 330MB HPIB drives
contained in a 7963B behemoth of an enclosure; these
I plug in the standard HPIB connector. I have 64MB in
it. For a while, I used it as a pretty decent web
server. When I get it back up that's what I am going
to use it for.
I've put pictures of some of the stuff above at
http://jimulco.autonoma.edu.co/~carlos/hp/
No hp380 pics yet, though. Later.
carlos.
--
Carlos E. Murillo-Sanchez email: carlos_murillo(a)ieee.org
Universidad Autonoma de Manizales, Manizales, Colombia
and
428 Phillips Hall, Cornell University, Ithaca, NY 14853, USA
Does anyone in the list here on the east coast have a 19" rack they are
looking to get rid of? I really could put on of those to goo use.
-Linc Fessenden
In The Beginning there was nothing, which exploded - Yeah right...
Calculating in binary code is as easy as 01,10,11.
gee, without CPU cards, it can hardly be *called* an 11/34... just
a BA11 box which just so happens to have an 11/34 programmers
console attached...
(maybe it even has the correct backplane, but who knows)
Megan Gentry
Former RT-11 Developer
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